Astronauts may be able to make cement using their own pee

Future astronauts could make lunar buildings out of moon dust and pee. That’s the suggestion of chemist Anna-Lena Kjøniksen and her colleagues, who made a cement from urea — a major component of urine — and faux lunar soil. When humans take up long-term residence on other planets or the moon, they will need to pack light, in part because shipping materials from Earth is expensive. NASA has estimated that every pound of material sent into orbit around the Earth costs around $10,000.

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